add gitignore

Author: al8n

.gitignore

@@ -0,0 +1,18 @@
+**.idea/
+
+# Generated by Cargo
+# will have compiled files and executables
+**target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+**Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+
+# Added by cargo
+
+/target
+Cargo.lock